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Haskell reference |

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Module: | Prelude |
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Function: | foldr1 |

Type: | (a -> a -> a) -> [a] -> a |

Description: | it takes the last two items of the list and applies the function, then it takes the third item from the end and the result, and so on. See scanr1 for intermediate results. |

Related: | foldl, foldl1, foldr, scanl, scanl1, scanr, scanr1 |

Example 1

**Input: **foldr1 (+) [1,2,3,4]

**Output: **10

Example 2

**Input: **foldr1 (/) [8,12,24,4]

**Output: **4.0

Example 3

**Input: **foldr1 (/) [12]

**Output: **12.0

Example 4

**Input: **foldr1 (&&) [1>2,3>2,5==5]

**Output: **False

Example 5

**Input: **foldr1 max [3,6,12,4,55,11]

**Output: **55

Example 6

**Input: **foldr1 (\x y -> (x+y)/2) [12,4,10,6]

**Output: **9.0